Technology and system for treating hydrochloric acid regeneration device tail gas

Abstract

The invention relates to a technology and a system for treating hydrochloric acid regeneration device tail gas. The technology comprises steps as follows: 1) the hydrochloric acid regeneration device tail gas coming out of an absorption tower enters a condenser to indirectly exchange heat with cooling water, and condensate formed after condensation of part of water vapor in the tail gas enters a collecting water tank to be used as a spraying liquid of the absorption tower; 2) the cooling water is heated through heat exchange, then enters a cooling tower and returns to the condenser for recycling after cooled again; 3) the tail gas comes out of the condenser, is pressurized by a smoke exhaust fan and enters an alkaline washing tower, hydrochloric acid in the alkaline washing tower is thoroughly neutralized, and the acid content of the finally discharged tail gas is smaller than or equal to 10 mg / m<3>. With the adoption of the technology and the system, up-to-standard discharge of the hydrochloric acid regeneration device tail gas is realized, meanwhile, the process cooling water can be recycled, the condensate is used as the spraying liquid of the absorption tower, so that water for washing is saved, and power consumption is reduced; the total discharge amount of the tail gas can be reduced, the load of the smoke exhaust fan is reduced, and the technology is simple and easy to implement, low in investment and particularly applicable to transformation of old plants, takes effect quickly and is another good method worthy of popularization for energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of energy saving and emission reduction of a hydrochloric acid regeneration device in the metallurgical industry, in particular to a tail gas treatment process and a treatment system of a hydrochloric acid regeneration device. Background technique [0002] At present, the tail gas treatment process of the hydrochloric acid regeneration unit commonly used is: the high-temperature furnace gas of about 395°C discharged from the roasting furnace of the hydrochloric acid regeneration unit is sprayed with waste acid in the pre-concentrator to cool down to about 97°C, and then enters the absorption tower and the washing tower Reverse contact with the upper spray water to absorb and wash the acid gas. At this time, the acid-containing furnace gas has been saturated with water and turned into water vapor, which is discharged into the atmosphere from the chimney of the device. After the discharged acid-containing water...

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Problems solved by technology

[0002] At present, the tail gas treatment process of the hydrochloric acid regeneration unit commonly used is: the high-temperature furnace gas of about 395°C discharged from the roasting furnace of the hydrochloric acid regeneration unit is sprayed with waste acid in the pre-concentrator to cool down to about 97°C, and then enters the absorption tower and the washing tower Reverse contact with the upper spray water to absorb and wash the acid gas. At this time, the acid-containing furnace gas has been saturated with water and turned into water vapor, which is discharged into the atmosphere from the chimney of the device. After the discharged acid-containing water vapor condenses into water and falls, it will affect the plant area The nearby equipment and buildings cause certain corrosion, causing harm to the environment, especially the residents around the factory area have great opinions

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